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174 lines
5 KiB
C
174 lines
5 KiB
C
#ifndef PSYC_TEXT_H
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#define PSYC_TEXT_H
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/**
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* @file psyc/text.h
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* @brief Interface for text template rendering.
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*
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* All text template functions and the definitions they use are
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* defined in this file.
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*/
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/**
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* @defgroup text Text template functions
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*
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* This module contains all text template functions.
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* @{
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*/
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/**
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* Return values for the text template parsing function.
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* @see psyc_text()
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*/
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typedef enum {
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/// No substitution was made, nothing was written to the buffer.
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PSYC_TEXT_NO_SUBST = -1,
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/// Text template parsing & rendering complete.
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PSYC_TEXT_COMPLETE = 0,
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/// Text template parsing & rendering is incomplete, because the buffer was too
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/// small. Another call is required to this function after setting a new buffer.
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PSYC_TEXT_INCOMPLETE = 1,
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} PsycTextRC;
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/**
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* Return values for PsycTextCB.
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*/
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typedef enum {
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/// Value not found, don't substitute anything.
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PSYC_TEXT_VALUE_NOT_FOUND = -1,
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/// Value found, substitute contents of the value variable.
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PSYC_TEXT_VALUE_FOUND = 0,
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} PsycTextValueRC;
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/**
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* Struct for keeping PSYC text parser state.
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*/
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typedef struct {
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size_t cursor; ///< current position in the template
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size_t written; ///< number of bytes written to buffer
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PsycString tmpl; ///< input buffer with text template to parse
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PsycString buffer; ///< output buffer for rendered text
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PsycString open;
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PsycString close;
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} PsycTextState;
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/**
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* Callback for psyc_text() that produces a value for a match.
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*
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* The application looks up a match such as _fruit from [_fruit] and
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* if found sets value->data & value->length to point to the found value,
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* "Apple" for example. 0 is a legal value for the length.
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* The callbacks returns either PSYC_TEXT_VALUE_FOUND or
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* PSYC_TEXT_VALUE_NOT_FOUND if no match found in which case psyc_text
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* leaves the original template text as is.
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*/
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typedef PsycTextValueRC (*PsycTextCB) (const char *name, size_t len,
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PsycString *value, void *extra);
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/**
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* Initializes the PSYC text state struct.
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*
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* @param state Pointer to the PSYC text state struct that should be initialized.
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* @param tmpl Input buffer with text template to be parsed.
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* @param tmplen Length of input buffer.
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* @param buffer Output buffer where the rendered text is going to be written.
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* @param buflen Length of output buffer.
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*/
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static inline void
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psyc_text_state_init (PsycTextState *state,
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char *tmpl, size_t tmplen,
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char *buffer, size_t buflen)
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{
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state->cursor = 0;
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state->written = 0;
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state->tmpl = (PsycString) {
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tmplen, tmpl};
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state->buffer = (PsycString) {
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buflen, buffer};
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state->open = (PsycString) {
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1, "["};
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state->close = (PsycString) {
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1, "]"};
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}
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/**
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* Initializes the PSYC text state struct with custom opening & closing braces.
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*
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* @param state Pointer to the PSYC text state struct that should be initialized.
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* @param tmpl Input buffer with text template to be parsed.
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* @param tmplen Length of input buffer.
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* @param buffer Output buffer where the rendered text is going to be written.
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* @param buflen Length of output buffer.
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* @param open Opening brace.
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* @param openlen Length of opening brace.
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* @param close Closing brace.
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* @param closelen Length of closing brace.
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*/
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static inline void
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psyc_text_state_init_custom (PsycTextState *state,
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char *tmpl, size_t tmplen,
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char *buffer, size_t buflen,
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char *open, size_t openlen,
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char *close, size_t closelen)
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{
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state->cursor = 0;
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state->written = 0;
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state->tmpl = (PsycString) {
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tmplen, tmpl};
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state->buffer = (PsycString) {
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buflen, buffer};
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state->open = (PsycString) {
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openlen, open};
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state->close = (PsycString) {
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closelen, close};
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}
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/**
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* Sets a new output buffer in the PSYC text state struct.
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*/
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static inline void
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psyc_text_buffer_set (PsycTextState *state, char *buffer, size_t length)
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{
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state->buffer = (PsycString) {
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length, buffer};
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state->written = 0;
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}
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static inline size_t
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psyc_text_bytes_written (PsycTextState *state)
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{
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return state->written;
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}
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/**
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* Fills out text templates by asking a callback for content.
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*
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* Copies the contents of the template into the buffer while looking for the
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* opening and closing brace strings and calling the callback for each enclosed
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* string between these braces. Should the callback return
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* PSYC_TEXT_VALUE_NOT_FOUND, the original template text is copied as is.
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*
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* Before calling this function psyc_text_state_init should be called to initialize
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* the state struct. By default PSYC's "[" and "]" are used but you can provide
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* any other brace strings such as "${" and "}" or "<!--" and "-->" if you use
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* the psyc_text_state_init_custom variant.
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*
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* @see http://about.psyc.eu/psyctext
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**/
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PsycTextRC
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psyc_text (PsycTextState *state, PsycTextCB getValue, void *extra);
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extern const PsycTemplates psyc_templates;
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static inline const char *
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psyc_template (PsycMethod mc, size_t *len) {
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PsycString t = psyc_templates.a[mc];
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if (len)
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*len = t.length;
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return t.data;
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}
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/** @} */ // end of text group
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#endif
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